Gluteus maximus EMG amplitude is higher when muscle fibers are shorter (in full hip extension compared to flexion, in hip abduction compared to neutral, in hip external rotation compared to neutral, and
in posterior pelvic tilt compared to anterior pelvic tilt).
In this apparatus, gluteus maximus EMG amplitude was significantly higher
in posterior pelvic tilt compared anterior pelvic tilt (41 % of MVIC vs. 18 % of MVC).
The oblique muscles will help to curl the trunk forward, like in a crunch, and they will also assist in tilting the pelvis back, like
in posterior pelvic tilts.
Not exact matches
When your
pelvic is NOT
in the correct position — when it is tipped back (
posterior tilt, as seen at right
in the photos above)-- the
pelvic organs descend right on down through the space that makes the birthing canal.
The gluteus maximus not only is used
in powerful movement that require hip extension (jumping, stair climbing) but it also is a muscle that helps create a
posterior pelvic tilt.
In this video when you go past parallel, your pelvis goes into a
posterior pelvic tilt.
If the range of motion for the hips is approximately 90 degrees and
in order to increase range of motion then one has to create a
posterior pelvic tilt / lumbar flexion, then wouldn't going past 90 degrees contribute to lumbar flexion / butt wink?
The RKC plank — which requires a slight
posterior pelvic tilt (hips tucked toward your torso), forcing you to contract your glutes and engage more of your ab muscles — is especially effective for training your midsection to work
in overdrive.
Similar to lordosis due to the exaggerated extension of the lower back, but the difference
in a swayback is the lower back is flattened and there is a
posterior pelvic tilt.
But when your pelvis is NOT
in the correct position — when it is tipped back (
posterior tilt, as seen at right
in the photos above)-- the
pelvic organs descend right on down through the space that makes the birthing canal.
The long lever plank variations resulted
in higher rectus abdominis muscle activity compared to the standard plank variations, irrespective of
posterior pelvic tilt.
There was a trend towards greater external oblique muscle activity
in the long lever plank with
posterior pelvic tilt compared to the long lever plank without
posterior pelvic tilt (148 vs. 111 % of MVC).
It was also higher when performing
posterior pelvic tilt in a bent - leg position with feet
in the air (90 degrees at hip and knee) than
in the other positions.
There was a trend towards higher rectus abdominis muscle activity
in the long lever plank with
posterior pelvic tilt compared to the long lever plank without
posterior pelvic tilt (109 % vs. 90 % of MVIC).
It has been suggested that weak or tight muscles might lead to excessive anterior or
posterior pelvic tilt in normal standing posture.
Posterior pelvic tilt produced higher rectus abdominis muscle activity than abdominal hollowing
in all positions.
The reduced anterior
pelvic tilt when using this starting position will most likely explain the superior results for muscle activation, as gluteus maximus EMG amplitude is generally increased by
posterior pelvic tilt in the prone hip extension (Tateuchi et al. 2012; Tateuchi et al. 2013), as
in standing (Kim and Seo, 2015).